This name is a synonym of Symphyotrichum grandiflorum (L.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record FC00223B-E301-4204-99BF-B7EC40DE4CF2) with original publication details: Sp. Pl. 877 1753.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:181340-1.
This name was in version 1 of The Plant List, record gcc-113574, and has not been changed.